Ubuntu repository download iso
The Ubuntu team doesn't make a downloadable ISO of the repository contents to my knowledge. You should be able to easily create one yourself using APTonCD though, or download unofficial ones somebody has made from here. APTonCD allows you to select which repositories or sections you want and download them as CD/DVD images so you can conserve bandwidth.
If you want, you can also try the long way or purchase DVDs with the repository contents on them.
See "How to make your own Ubuntu Repository DVDs".